Three-body Coulomb explosion of triply charged methanol-d (CH3OD3+), CH3OD3+ -> H+ + H-2(+) + COD+ induced by a laser field of (approximate to 2 x 10(14) W/cm(2)), is investigated by. the coincidence momentum imaging (CMI) method. It is securely identified that the explosion proceeds in a stepwise manner and that there are two types of sequential pathways: one is a pathway in which H+ is ejected first, and the other is a pathway in which H-2(+) is ejected first. Dynamical information on the two types of explosion processes is extracted from the analysis of CMI correlation maps. (c) 2006 Elsevier B.V. All rights reserved.